Recently I installed a copy of Oneiric Ocelot 11.10 on my ThinkPad. Everything went fine, I installed the gnome shell and gnome-tweak-tool to customize everything. I changed the shell theme, the GTK+ theme and the icon set.

After everything fit my needs perfectly, I installed some updates from the update manager (no upgrades, just small updates). I had to restart, and after I restarted, my gnome shell was broken. In tweak-tool, it showed the customized shell as the default one, and my gtk theme was broken as well (it looked like two themes "frankensteined" together...). The bad thing was - I couldn't get things back into the default settings!

So the only thing left was to use the -non broken- unity shell.

What can I do to stop these things from happening? (I mean...sure I could avoid the updates, but that would be kind of stupid, too.)

I only have these PPAs installed:

• ferramroberto-gnome3-oneiric.list (and .save),
• playonlinux.list (and .save)

And how can I fix the broken gnome-shell?